package com.itheima.reggie.filter;


import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

//检查用户是否登录
@Slf4j
@WebFilter(filterName="LoginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {

    //路径匹配器
    public static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();


    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        /*获取本次请求的URI
         判断本次请求, 是否需要登录, 才可以访问
         如果不需要，则直接放行
         判断登录状态，如果已登录，则直接放行
         如果未登录, 则返回未登录结果*/


        String requestURI = request.getRequestURI();
        log.info("拦截到请求：{}", request.getRequestURI());
        //不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login",
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"
        };
        boolean check = check(urls, requestURI);
        if (check) {
            //放行
            log.info("本次请求{}不需要处理", request.getRequestURI());
            filterChain.doFilter(request, response);
            return;
        }


        if (request.getSession().getAttribute("employee") != null) {
            log.info("用户已登录，用户id：{}", request.getSession().getAttribute("employee"));
         /* long id = Thread.currentThread().getId();
            log.info("线程id为：{}",id);*/
            //获得在这个线程内登录的用户id
            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request, response);
            return;
        }

        //移动端用户登录判断
        if (request.getSession().getAttribute("user") != null) {
            log.info("用户已登录，用户id：{}", request.getSession().getAttribute("user"));
         /* long id = Thread.currentThread().getId();
            log.info("线程id为：{}",id);*/
            //获得在这个线程内登录的用户id
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request, response);
            return;
        }
        log.info("用户未登录");
        //如果未登录返回未登录结果，通过输出流的方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    //定义路径是否放行的方法
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if(match){
                return true;
            }
        }
        return false;
    }
}
